The partner of a 20-year-old Australian woman killed in a jet ski crash has claimed full responsibility for his girlfriend’s death in Thailand.

Emily Jayne Collie, from Kyabram in Victoria, was pulled unconscious from the water at Kata Beach in Phuket last Saturday after the jet ski she had hired collided with another being ridden by her boyfriend, Tommy Keating.

Mr Keating, 22, was arrested and later charged with reckless driving causing death.

He reportedly told police he was unable to see Ms Collie’s jet ski due to the bright reflection of the sun on the water.

In a media statement released through the Department of Foreign Affairs and Trade (DFAT), Mr Keating accepted the charge he was given in a Thai court.

"This was a tragic accident. However I take responsibility for what happened. And I have decided that the best thing is to accept a charge of careless driving leading to death," he said.

Mr Keating expressed his deepest apologies to Ms Collie's parents.

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He spoke of the "unbearable sorrow at the loss of my soul mate Emily, who I loved more than anything in this world, as well as my never-ending apologies and condolences to Ian and Sally Collie and the rest of their family".

"They have my heartfelt gratitude for the love and support they have shown me while they are coping with the most devastating loss imaginable," he said.

Lifeguards performed CPR on Ms Collie after pulling her from the water until paramedics loaded her into an ambulance and rushed her to a nearby hospital.

She suffered severe neck and shoulder injuries and was pronounced dead upon arrival.

Mr Keating was pictured breaking down in the back of the ambulance.

Mr Keating was pictured breaking down in the back of the ambulance following the crash. (Facebook) ()

His family has vowed to care for and love him as fiercely as Ms Collie had during their 18-month relationship.

Ms Collie's family have told authorities it was a tragic accident and no one is to blame.

Mr Keating has since taken to Facebook to post a touching tribute to Ms Collie, calling her his “beautiful girl”.

“I love you so much Emily and I wish I could just bring you back into my arms,” he wrote.

“I'm so broken and I know I'll never, never be able to mend.

“You where [sic] such an inspiration to myself and many others! The most beautiful girl I’ve ever met! Inside and out!”

Ms Collie’s family released a statement saying her death has left them devastated.

"Emily was our princess, everything shined bright when she was around. She was the most caring person and deeply loved her family more than anything in the world," they said.

"She was looking forward to celebrating her 21st birthday this year and completing her pharmacy degree.

"The family would like to thank everyone for the love and support during this difficult time.

“She left a hole in our hearts.”

DFAT, through its Smartraveller website, warns Australian travellers of the risks of riding jet-skis in Thailand, including issues related to insurance cover.

After the accident, members of the Royal Thai Navy, Marine Police and Kata Police found six jet-ski operators working from Kata Beach were renting craft without the required insurance.

Karon Police Chief Colonel Sanya Thongsawad told local media the police had no choice but to press charges of reckless driving against Mr Keating.

"By law in Thailand, when an incident results in the death of a person, police are required to formally press a charge," Col. Thongsawad said.

The Thai public prosecutor is now preparing a case expected to be presented to court within the next fortnight.

Thai media reports say Mr Keating may face a suspended jail sentence after the guilty plea, but under Thai law the charge could result in a jail term of up to 10 years.